﻿using System;

class Program
{
    static void Main()
    {
        Console.Write("请输入月份：");
        int months = Convert.ToInt32(Console.ReadLine());

        if (months <= 0)
        {
            Console.WriteLine("月份必须为正整数。");
            return;
        }

        long a = 1; // 第一个月的兔子对数
        long b = 1; // 第二个月的兔子对数

        Console.WriteLine($"第1个月：{a}对");
        if (months == 1) return;

        Console.WriteLine($"第2个月：{b}对");
        if (months == 2) return;

        for (int i = 3; i <= months; i++)
        {
            long next = a + b;
            Console.WriteLine($"第{i}个月：{next}对");
            a = b;
            b = next;
        }
    }
}